import 'package:flutter/material.dart';

import 'dart:math' as math;
void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a purple toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // TRY THIS: Try changing the color here to a specific color (to
        // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
        // change color while the other colors stay the same.
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body:  Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Container(
            color: Colors.red,
            width: 330,
            height: 330,
            child: CircleTextWrapper(
              radius: 110,
              text:     "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s." * 2,
            )),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}


class CircleTextWrapper extends StatelessWidget {
  const CircleTextWrapper({
    Key? key,
    this.radius = 110,
    this.text =
    "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s.",
    this.textStyle = const TextStyle(fontSize: 20),
    this.startAngle = 0,
  }) : super(key: key);
  final double radius;
  final String text;
  final double startAngle;
  final TextStyle textStyle;
  @override
  Widget build(BuildContext context) => CustomPaint(
    painter: _Painter(
      radius,
      text,
      textStyle,
    ),
  );
}

class _Painter extends CustomPainter {
  _Painter(this.radius, this.text, this.textStyle, {this.padding = 12});
  final double radius;
  final String text;
  final double padding;

  final TextStyle textStyle;
  final _textPainter = TextPainter(textDirection: TextDirection.ltr);
  final Paint _paint = Paint()
    ..blendMode
    ..color = Colors.white
    ..strokeWidth = 2
    ..style = PaintingStyle.stroke;
  @override
  void paint(Canvas canvas, Size size) {
    canvas.translate(size.width / 2, size.height / 2);
    canvas.drawCircle(Offset.zero, radius + padding, _paint);

    String lineText = "";
    _textPainter.text = TextSpan(text: lineText, style: textStyle);
    _textPainter.layout(
      minWidth: 0,
      maxWidth: double.maxFinite,
    );

    double y = -radius + _textPainter.height * .6;
    double x = math.sqrt(radius * radius - y * y);
    for (int i = 0; i < text.length; i++) {
      lineText += text[i];
      _textPainter.text = TextSpan(text: lineText, style: textStyle);
      _textPainter.layout(
        minWidth: 0,
        maxWidth: double.maxFinite,
      );

      if (_textPainter.width >=
          (Offset(-x, y) - Offset(x, y)).distance - textStyle.fontSize! * .5) {
        _textPainter.paint(canvas, Offset(-x, y - _textPainter.height * .6));
        // canvas.drawLine(Offset(-x, y), Offset(x, y), _paint);
        y += _textPainter.height;
        x = math.sqrt(radius * radius - y * y);
        lineText = "";
      }

      if (i == text.length - 1) {
        _textPainter.paint(canvas, Offset(-x, y - _textPainter.height * .6));
        //  canvas.drawLine(Offset(-x, y), Offset(x, y), _paint);
      }
    }
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) => true;
}